STAR Flow, Chirality and Vorticity PWG

[EsumiShinIchi <esumi.shinichi.gn AT u.tsukuba.ac.jp>]

Dear Prithwish and all

Thank you very much. 

(1) (TOF4 && EPDW) or (TOF4 && EPDE) 
(2) TOF4 && (EPDW || EPDE) 
(3) TOF4 && (EPDW && EPDE) 

"EPDTAC diff (green)” corresponds to the EPD E&W, and
“EPDEW (green)” corresponds to the EPD E+W with a 
threshold on the sum? 

I wrote “or” and “||” differently and intentionally in above (1)-(3), 
so if we add both sides of “or” in (1), it’ll become sane as (2) 
as Mike was agreeing in the meeting, right? If you take timing 
difference between EPDW and EPDE, we need to require hits 
on both EPDs, therefore it’ll become (3). In order to be less 
biased (in terms of forward and backward symmetry) high 
multiplicity (biased) event, I think (3) is better, since we would 
like to give a maximum biased high activity p+p event. Having 
same threshold on TOF4, we might be able to increase the 
threshold on EPD for (1) and (2) cases, while we could keep 
relatively lower threshold on EPD in (3) case for the same rejection 
factor. If we have the same EPD threshold we could also select 
the same sample as (3) later in offline within the triggered 
events of (1) or (2). 

Considering the TOF acceptance is smaller than full iTPC 
eta acceptance, we might be affected by the centrality/activity 
selection bias, when we do TOF multiplicity dependent 
"dphi vs deta” analysis, in that sense, we might like to have 
somewhat higher threshold on EPD relatively to TOF. We 
could start by taking Shengli’s minimum cuts on the high 
multiplicity selection on TOF hits (top ~10% fraction?) for the 
TOF4 threshold, and tune the EPD threshold by looking at 
the rejection factor? I do not know whether we like to give 
an for/back asymmetric bias intentionally for the our forward 
detector. I thought not, or? 

Best regards, ShinIchi

> On Apr 24, 2024, at 23:19, Prithwish Tribedy via Star-fcv-l 
> <star-fcv-l AT lists.bnl.gov> wrote:
> 
> Dear All,
> To follow up on the discussion, please chime in with your inputs for the 
> trigger setup. As Jeff is configuring the triggers, we need to inform him 
> of the thresholds.
> 
> Here is one slide:
> https://drupal.star.bnl.gov/STAR/system/files/run24_trigger_pp_high_mult.pdf
> 
> What should be the TOF hit cut (TOF4 threshold)? What should be the EPD 
> thresholds?
> 
> Best,
> Prithwish
> 
> On 2024-04-24 07:57, tan via Star-fcv-l wrote:
>> Dear All,
>> This is Li-Ke’s slides link, his email account has some issues when
>> send email to STAR mail-list.
>> https://drupal.star.bnl.gov/STAR/system/files/FXTv2_Request_Preliminary.pdf
>> Thank you!
>> Best regards,
>> Tan
>>> 2024年4月22日 11:18，subhash via Star-fcv-l
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